Motor



W. SPARKS.

MOTOR.

APPLICATION FILED MAR. 16. 1917.

Patented @013. 12, 1920.

Iii... M 5/ I a. n a n 1 3 lllnull In 1 2 INVENTOI? UNITED STATES PATENT OFFICE.

WILLIAM SPARKS, OE JACKSON, MICHIGAN, ASSIGNOR TO THE SPARKS-WITHINGTON COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

MOTOR.

Application filed March 16, 1917.

. State of Michigan, have invented new and useful Improvements in Motors, of which the following, taken in connection with the accompanying drawings, is a full, clear, and

exact description.

This invention relates to certain improve-.

ments in motors.

Reference is hereby made to my co-pending application Serial No. 765,792.

he main object of the invention is to produce an efficient motor of simple construction and light weight, at minimum expense for materials and labor, such a motor being peculiarly adapted for use in connection with electric horn or signal.

The invention takes form in a device comprised entirely of pressed metal, and is an improvement upon the construction shown, described and claimed in my copending application, Ser. No. 765,792, Patent No. 1,237,717, dated Aug. 21, 1917.

A marked improvement resides in the form and method of producing the pole pieces and field coils, the required number of ampere'turns of wire in the field coils being obtained from a materially reduced quantity of wire. As an illustration, in signals of a predetermined size, each field coil has heretofore embodied approximately-seventy-eight (78) feet of wire to obtain the required flux, whereas in the present signal the same number of ampere turns and the same flux is obtained with approximately thirty-seven (37) feet of wire. This im provement may be effected by coiling the wire to form the field coils, directly about the pole pieces, the latter being preferably of substantially circular form and of relatively small diameter.

Other objects and advantages will appear from the following-description, taken in connection with the accompanying drawings, in which Figure 1 is a side elevation of the signal.

Fig. 2 is a section on line 22, Fig. 1.

Fig. 3 is a section taken at right angles to Fig. 2.

Fig. 4. is a section taken on line 4-4, Fig. 1.-

Fig. -5 is an enlarged section ofthe ad- Specification of Letters Patent.

Patented Oct. 12, 1920. Serial No. 155,262.

justable bearing for the rear end of the m0- tor shaft.

The signal embodies the usual resonator l front case section 2, rear case section 3, between which case sections the periphery of diaphragm 4 is clamped. The section 2 may, as shown, be provided with a circular flange 5 adapted to inclose the edge of the diaphragm and the rear case section 3-.

Preferably the rear case section is of dished formation and is provided with a transverse wall .6 substantially parallel with the diaphragm and spaced therefrom a sufiicient distance to permit reasonable adjustment and eflicient operation of a cam -7 coacting with a wear-piece 8 upon the diaphragm to vibrate the latter as the former is rotated.

The cam 7 is mounted upon the armature shaft 9 of an electric motor, the shaft 9 having one bearing in the transverse wall 6 and its opposite end adjustably mounted in a transverse portion .10 of a U-shaped case 11 having its side walls -12 and -13 substantially parallel with each other and lying substantially perpendicular to the transverse wall 6 and having their ends reduced and threaded and extended through said transverse wall forcoaction with nuts 14 and l5 for rigidly securing the U- shaped case to 'the rear diaphragm case section.

The U-shaped case is formed of a relatively narrow thin strip of sheet metal, as sheetsteel, bent in the form shown and having its transverse portion -10 provided with an internally threaded opening for coaction with an externally threaded bearing -16 adjustable through said transverse portion and having a recess l7 provided with an overhanging flange -18.

The adjacent end of shaft 9 may be locked in this recess in any suitable manner so as to be positively moved toward and from the diaphragm upon movement of said bearing through the transverse portion, and, for this purpose and as illustrative of one suitable construction, the shaft -9- is provided with a recess which may extend circumferentiallyof the shaft for the reception of a spring ring 19 adapted to passed formed by flange 18 and to expand under its own resiliency after passing the flange -18, to engage the inner surface shaft.

of said flange and prevent removal. of the shaft from the bearing and cause the shaft to move positively with the bearing. The bearing maybe locked relatively to the transverse wall 10, if desired, by a suitable lock nut 20-.

The side portions l2 and -.13- carry suitable brushes 21- for contact with the commutator'22 upon the armature These brushes may be supported in any suitable manner, and as shown are slidably mounted in housings 23- secured to the respective walls 12 and -l3 by screws 24-, each brush being pressed into contact with the commutator by spring -25 and provided with a spring finger 26-, as shown, having one end ex tending within the housing -23 and its opposite end in contact with the brush outside the housing for transferring current directly from the brush to the housing without the necessity of the current' passing through the spring, the finger preferably being formed of material of greater conductivity, than the spring. This is advantageous by reason of the fact that the heat generated by the passage of electricity through the spring tends to decrease, and ultimately destroy, its resiliency.

The side portions 12-- and 13 carry inwardly projecting studs -27- secured to the side portions in any suitable way, as by welding, flanging, or the like. In this illustration the side walls are provided with openings through which the studs extend, the ends of the studs being flanged, riveted or welded into engagement with the side portions, and preferably the welded or flanged, parts are countersunk within said portions.

The studs are preferably provided with enlarged portions 28- adapted toabut ent articles of manufacture for mounting upon the pole pieces, the wire for forming the coils is wound about the enlarged portions 28 of studs 27 to constitute sufficient ampere turns, such coils 31 being circular in form and of relatively small diameter and confined between the platelike parts 30-- and the side portions portions 12 and '13, respectively. The wire from which the field coils are formed may be covered with any suitable insulating composition or material.

The plate-like portions of the pole pieces are preferably, as shown, of a conformation adapted to conform to and surround the adjacent portion of the armature -31 and may, as shown, be angular in form having a central portion and opposite side portions extending therefrom and lying in three separate planes substantially tangent to their respective adjacent portions of the commutator. l

Preferably the transverse wall -6 is provided with openings permitting the passage of the wires or other conductors from the field coils to terminals -32', the opposite ends of the wires being electrically connected in the usual manner to the brushes -2l-.

Preferably the U-shaped case and the remaining portions of the motor are inclosed by a cup-shaped casing 33 having its open" end fitted over the rear diaphragm case section 3. The casing may be secured to the U-shaped case in any suitable way, as by screw 34, if desired.

Suitable insulating material in sheet or plate form is utilized where desired, as in spacing the field'coils from the pole pieces, etc., and-although I have shown and described a specific construction, form and arrangement of parts as perhaps preferable, I do not desire to limit myself to the same as many changes may be made in the details of each without departing from the scope of this invention as set forth in the appended claims.

What I claim is 1.-A motor comprising a U-shape sheet metal frame having oppositely. disposed openings in the side walls thereof, pole pieces each comprising a central portion and a pair of studs extending from opposite ends thereof, respective studs extended through the openings in the said frame and permanently secured to the frame, sheet' metal pole shoes having openings through which the other respective studs extend, thestuds and pole shoes being permanently secured together and said pole shoes extending laterally from the pole piece, wire wound tightly about the pole pieces and confined between the pole shoes and the U-shape frame and an armature positioned between the pole shoes.

2. A motor comprising a U-shape sheet metal frame, having reduced end parts, an end wall extending across the open end of the U-shape frame and having a pair of openings through which the reduced end port-ions of said U-shape frame extend and means mounted on the reduced end portions for rigidly securing the U-shape frame to said end Wall, said U-shape frame having oppositely disposed openings in the side Walls thereof, pole pieces each comprising a central portion and a pair of studs extending from opposite ends thereof, respective studs extending through the openings in said frame and permanently secured to the frame, sheet metal pole shoes having openings through which the other respective studs extend, said studs and pole-shoes being permanently secured together and said pole shoes extending laterally from their respective pole pieces, Wire tightly coiled about the pole pieces and confined between the vpole shoes and the U-shape frame and 15 an armature having its shaft mounted in the base of the U-shape frame and the end Wall and rotatable between said pole shoes.

In witness whereof I have hereunto set my hand this 28th day of February, 1917. 20

WILLIAM SPARKS. Witnesses:

WILLIAM WUNDERL GH, N. J. CARLETT. 

